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To create a whistling noise like that of blowing over a bottle, except using another person's shit hole. Thus a shit whistler. Can be used to imply someone is of a homosexual persuasion.
Mike in a childish voice up the stairs: "I've just turned all the items in your room upside down..."

James runs to his room...

James: "Ahh mannn! You dirty little shit whistler!!"
by Cranberries12345 January 13, 2011